20A DC motor speed controller with PWM knob

The 20A DC Motor Speed Controller is a high-current PWM module designed for precise speed control of DC motors, fans, pumps, and other heavy DC loads. With a simple rotary knob, you can adjust the output duty cycle from 0% to 100%, delivering smooth and efficient speed control without the power losses of resistive methods. The 20A rating makes it ideal for larger motors and higher-power applications where the 10A variant falls short.

Key Features:

• PWM speed control via rotary potentiometer knob
• Adjustable duty cycle: 0% to 100%
• Wide input voltage range: DC 6V to 30V
• Maximum continuous current: 20A
• High-efficiency MOSFET switching — minimal heat generation
• PWM frequency: ~13 kHz (inaudible range for most motors)
• LED power indicator
• Compact PCB with screw terminal connections
• Suitable for 12V and 24V DC systems

Specifications:

• Input voltage: DC 6V – 30V
• Output current: 20A continuous (peak higher with heatsinking)
• Control method: PWM via potentiometer
• Duty cycle: 0% – 100%
• PWM frequency: ~13 kHz
• Dimensions: ~50 x 40 mm (approx.)

Applications:

• High-current DC motor speed control (12V / 24V)
• Industrial fan and blower speed regulation
• Water pump and irrigation pump flow control
• High-power LED dimming
• DIY robotics, CNC, and automation projects
• Solar-powered DC load control
• Electric vehicle (EV) auxiliary motor control

Note: For loads above 15A, attach an external heatsink to the MOSFET for reliable continuous operation.